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My dog accidentally got a double dose of doxycycline. Is he okay?

Updated On September 23rd, 2025

Pet's info: Dog | Pomeranian | Male | unneutered | 3 years old

Hi Dr, I gave Chiyo (my teacup pomeranian 1.5 kg) double dose of doxycycline.. I gave him third pill of 100 mg, so i assume it is about 33-35 mg.. How bad is this?

3 Answers

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on December 18th, 2017

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! The maximum dose of doxycycline is 10mg/kg twice daily (or 20mg/kg/day). If you gave Chylo around 33-35mg that is 20mg/kg and he should be fine. Do not give him any more for 24 hours. Doxycycline is very hard on the stomach so he may have vomiting. I hope this helps and have a great day!

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Other Answers

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    Answered By Dr. B. DVM, DACVIM (Oncology)

    Veterinarian

    Published on August 22nd, 2018

    Although 100 mg is a little bit higher than our standard daily dose it is not that high. I am assuming that you normally give 50 mg once a day. If you've been giving 50 mg twice a day then I would just skip the evening dose and start over tomorrow. The most common side effects from doxycycline are GI related so watch for lethargy, decreased appetite, vomiting, or diarrhea and if noted contact your family vet. I hope this helps and thank you for using Petco Pet Education Center, formerly Petcoach!

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on July 14th, 2019

    Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Benny. In most cases, an overdose like this may cause GI distress such as nausea, vomiting, and/or diarrhea. It's not fatal or anything like that, so you do not need to be terrified. He should be ok. If you do see any vomiting or diarrhea, it is advisable to have him seen by a vet. If he's fine, just give him his next dose as scheduled. I hope this helps!

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